Compressibility and Pore Pressure Parameters - Unsaturated Soil Mechanics in Engineering Practice - page 808

are described under the topic of consolidation, collapse,
and swelling.
The application of a total stress (e.g., 100 kPa) may result
in a relatively small instantaneous change in the pore-air
pressure (e.g., say 15 kPa) and a somewhat larger instanta-
neous change in the pore-water pressure (e.g., say 30 kPa).
The remainder of the applied pressure is assumed to be
instantaneously adsorbed by the Hookean springs associated
with each of the two rheological models.

The dashpots adsorb more of the applied pressure and the
Hookean springs instantaneously adsorb less of the load if
the initial conditions of the soil are close to saturation. The
applied load is transferred from the Maxwell dashpots to
the Hookean springs (i.e., the process of consolidation) with
elapsed time. The processes that occur with elapsed time are
discussed as part of the consolidation process discussed in
Chapter 16.